Valve for percussive tools.



L. G. BAYLES.

VALVE FOR PERCUSSIVE TOOLS.

APPLICATION FILED MAY 31, 1912.

1,0562%; Patented Mar.18,1913.

A TTORNEV 'YUWETED snares TENT OFF1E LEWIS C. BAYLIJS, 014i EAST ON, EEHNSYKVMEA, ASSIGNOR TO INGEBSOLL-RAND COMPANY, NEW YORK, N. Y,, .A G OREORATION OF NEW JERSEY.

VALVE roe, rnnc'ussrva TOOLS.

To ail whom it may concern:

Be it known that I, LEWIS C. Barnes, a citizen of the United States, residing in Easton, in the county of Northampton and State of Pennsylvania, have invented certain new and useful Improvements in Valvesfor Percussive Tools, of which the following is a specification.

This invention relates to percussive tools and more particularly to a valve for such tools.

The type of valve to which this invention relates is that wherein the valve itself consists of a cylindrical body portion to which one or more wings are attached which control the inlet to the cylinder and, at the same time serve to oscillate the valve. Such a valve is shown in my former patent, Reissue 13,317 of November 21, 1911. In these valves as heretofore used the inlet ports of the cylinder have been controlled by one wing while the exhaust ports have been controlled by a wing or wings on the opposite side of the cylindrical body. As the pres sure on the inlet side of the valve is natu-- rally considerably greater than on the exhaust side, there is an unbalanced pressure tending to force the valve toward the exhaust side of the valve chest which produces some friction and eventually wear.

The object of the present inventionis to construct a valve which will operate. with equal facility and efiiciency and, at the same time, be perfectly balanced by opposing fluid pressures so that wear and friction are reduced to a minimum.

With this object in view I have devised a valve aipractical embodiment of which is shown in the accompanying drawings in which:

Figure 1 is a plan of the complete tool.

Fig. 2 is a longitudinal section on the line 11- 11 of Fig. 1. Fig. 3 is a transverse section through the valve chest on the line 1lilll of Fig. 2 and Fig. 4 is a section similarto Fig. 3 showing a modified form of the valve.

As shown in the drawings the tool comprises a cylinder 1 in which reciprocates the piston 2 which actuates by its impact the tool piece The tool is provided with the usual handle 11 secured to the cylinder by bolts 5. Between the rear end of the cylinder and the handle is a cylindrical valve chest 6. in the valve chest 6 is the valve Specification of Letters Patent.

Patented 111511218. 1913 Application filed May 31, 1912. Serial No. 700,638.

which consists of a cylindrical body portion 7 seated in, a correspondingly shaped bore in the valve chest. This cylindrical body 7 is provided with a tapered wing 8 which is adapted to oscillate from one side to the other'of a slot 9 into which the operating fluid is led. On the opposite side of the valve body from the slot 9 is a chamber 1Q which covers an area of the valve body; equal to that exposed in the slot 9. This" chamber is inconstant communication with the slot 9 through the passage 10. In the faces of the slot 9 and so'placed as to be alternately opened and closed by the faces of the wing 8 are cylinder inlet ports 11 and 12 which lead by passages 13 and 1 1, respectively, to the back and front end of the cylinder. From points in the cylinder nearer its center than the 0 ening of passage 13, exhaust passages 15 lead to ports 16 which opento the face of the valve body 7 at diametrically opposite points. From the front I end of the cylindenpassages 17 lead to ports 18 which alsoopen to the face of the valve body i points.

the valve body 7 is provided with a cylin-' drical bore 19 which communicates with the atmosphere at the port 20.. This is-placed in communication with the exhaust ports 16 and 18 by two series of diametrically opposite perforations 21 and 22 which are adapted to register alternately with the exhaust ports 16 and 18 as the valve oscillates from one position to the other.

In the modification shown in Fig. 4; the valve chest'is perforated by opposed passages 23 which are alternately connected with the exhaust ports 16 and 18 by recesses 24: in the face of the valve body 7.

In the operation of the tool, the piston being in the position shown in Fig. 2 and the valve being in the position shown in Fig. 3 fluid will be admitted to the back end of the cylinder through port. 11 and passage 13 and will drive the piston toward the front end .of the cylinder, the fluid in the forward end of the cylinder exhausting through pas- Q Loo other position. This Will allovv the operat ing fluid to enter the front end of the cylinder through port 1% and passage 14 and will move the piston in the other direction, exhaust passage 15 in this case being connected to the atmosphere by ports 22 being in regiser with ports 16.

it Will be apparent that the waive asde= scribed will operate with practically no friction or Wear, as the pressure on it in e cry direction is perfectly balanced. llhe pressure in the slot 9 tending to force the valve body downward is balanced by the same pressure acting on an equal area of the valve body surface in the chamber 10 while as the exhaust ports 16 and 18 are diainetrically opposed there are no unbalanced pressures from the exhaust of the operating iuid,

it is to be understood that the present .in said slot on said valve body, and cylinder exhaust ports controlled by said valve body.

2. In a percussive tool, a cylinder, its piston, a valve comprising a cylindrical body and a Wing, inlet passages controlled by said Wing, and extending to the ends of said cylinder, balanced sets 01 exhaust passages aeso from points nearer the middle of said cylinder than said inlet passages, extend ng to the face of the valve body and ports in said sets of exhaust passages With the atmosphere.

3. In a percussive tool, a cylinder, its piston, a valve comprising a cylindrical body and a Wing, a slot in which said Wing oscillates, cylinder inlet ports controlled by said Wing, means for admitting live fluid pressure to an area of said valve body to balance the fluid pressure in said slot on said valve body, and balanced cylinder e2;- haust ports controlled by said valve body.

l. in a percussive tool, a cylinder, its piston, a valve comprising a cylindrical body and a Wing, a slot in Which said Wing oscillates, cylinder inlet ports controlled by said Wing, means for admitting live fluid pres sure to an area o1 said valve body to balance the lluid pressure in said slot on said valve body, balanced sets or" exhaust passages from the cylinder to the face of said valve body and ports in said valve body for alternately connecting said sets of exhaust passages With the atmosphere.

5. a percussive tool, a cylinder, its piston, a valve comprising a cylindricalbody and a Wing, inlet passages from the ands of the cylinder controlled by said Wing, and balanced exhaust passages from points nearer the middle of said cylinder than said inlet passage, said exhaust passages being controlled by said valve.

lilEWlS C. BAYLE S.

l l itnesses it. 0 Areas, it lil'rnrrau.

valve body for alternately connecting said 

